Automatic stop for phonographs



W. J. BAKER.

AUTOMATIC STOP FOR PHONOGRAPHS.

APPLICATION FIL ED FEB. 26. 19l8.

1,382,405. Pmtemum 21,1921.

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W. .l. BAKER. AUTOMATIG'STOP FOR PHONOGRAPHSt APPLICATION FILED FEB. 25,1918- 1,382,405, PatentedJune 21, 1921.

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rrn stares W'ALTER J. BAKER, OF CHICAGO, ILLINOIS.

AUTOMATIC STOP FOR EHONOG-RAPHS.

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Specification of Letters Patent.

Patented June 21, 1921.

Application filed February 26, 1918. Serial No. 2.193%.

To all whom it may concern Be it known that I, WALTER J. BAKER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Automatic Stops for Phonographs, of which the following is a specification.

This invention relates to automatic stop attachments for phonographs; and has for its principal object to provide means for controlling the travel movement of the tone arm in accordance with the length of the musical composition being played.

l igure 1 is a top plan embodying the improved mechanism.

Fig. 2 is a vertical section on line 2, Fig. 1.

Fig. 3 is a vertical section on line 3, Fig. 1.

Fig. ais a'botto-m plan of the motor attachment.

Fig. is a partelevation and part section of the tone arm and its connections.

A may represent the top of a phonograph cabinet, B the turn-table, (l the vertical driving spindle on which the same is mounted, and D the tone-arm, all of which may be of any or the usual construction.

The outer turned down part 6, of the tone arm D, attendsv down through a hub 7 and ends in the cabinet top A, which provides a suitable bearing therefor, as shown in Fig. 5 and indicated by dotted lines in Fig. 2. The hub 7 rests on a stationary bearing ring 8 and is rigid on the tonearm and turns therewith in practical working. A gage ring 9 is loosely mounted on the hub 7 but is adapted to turn therewith and may be manually turned when the tone-arm is at rest. A friction disk 10, composed of felt, or other material siiiitable for the purpose, is mounted on the tone arm hub and las an annular hearing on ring 9. 1i. clamping collar 11 is also loose on the tone-arin and rests on the friction disk 10. This collar is E1(. 11St-&l)l( up and down in exerting a pressure on disk 10 in a greater or less degree as may be required and. is secured in a set position by a number of screws 12. The gage-ring, 9, is PI'OVlClGCl with a scale index finger 13, the free end of which rests on a graduated scale plate 1 1 secured to the top of the cabinet, as shown in Fig. 1. The ring 9 is also provided in the edge with a notch 15 which is cooperating feature with the indicating finger 13.

The clamping pressure of collar 11 on flexible disk 10 should be just sufiicient to compel gage-ring 9 to turn with the tonearm and at the same time permit of its being turned by hand in setting index finger 13 to any point on the scale-plate lt.

A stop-rod 16, havingan endwise movement, is supported on top of the cabinet by a number of guide bearing posts 17. In its normal position, shown in the drawing, the inner end of this rod bears against and rides on the rim edge of ring 9. A spring 18 is operatively mounted on rod 16 and normally holds the same in frictional contact with ring 9 as best shown in Fig. 1. The relative position of the stop notch 15 in ring 9, is between the adjacent end of rod 16 and the guide finger 13. The rod 16 is provided in its upper side with, a notch 19 having at one side a beveled or sloping wall 20, as best shown in Fig. 2. The free end of a trip arm 21 rests loosely on top of rod 16 and is normally held in the position shown in Figs. 2 and 3, which position corresponds to the relative position of the guide finger 13 and the notch 15 in the gage-ring 9. The hub 22 of the turn-table is provided with a fixed pin 23 projecting laterally therefrom, as shown in F ig. 1 and indicated by dotted lines in Figs. 2 and 3. The inner end of trip-arm 21 has two positions; its highest position above that of pin 23, as best shown in Fig. 3. The lowest position when it drops down into notch 19 and lies in the path of pin 23 so as to be contacted thereby at the proper time, the purpose of wnichwill be explained further along. of arm 21 has the inner end of a switch finger 25 inserted therein and operatively connected thereto by a horizontal pivot-pin 26. The inner end of finger 25. is rigid on the upper end of a vertical rocleshatt 27 which extendsdown through the top of the cabinet, as shown in Fig. The hub end 28 of a knife-switch lever 29 is mounted on the lower end of shaft 27, the free end being adapted to have circuit opening and closing contact with the knife switch connection 30, as shown in Figs. 3 and 4.

The graduated scale-plate 1 1 shows a graduated scale from 1 to 20 and the records will have a corresponding number or other character noted thereon which indicate the position to which the indicator 13 shall be set on the scale-plate 1 1. The diiferent parts are all set in their normal playing position as illustrated in the drawing. Each The fork end 2t of the records will be first tested to get the length of the piece to be played and the distance the tone arm will have to travel. This will be indicated by a number placed on the record. Now, supposing this number to be 15, the point of the finger will be placed on the corresponding number on the scale 14. This brings the notch 15 in disk 9 to the position shown in Fig. 1. Corresponding to this position the inner end of rod 16 bears against the edge of disk 9. The inner end of trip-arm 21 rests on top of rod 16 above the path of pin 23. When the end of the piece being played is reached, the disk 9 has moved just far enough to bring notch 15 into line with the adjacent end of rod 16 which is forced into engagement therewith by means or spring 18 imparting an endwise movement thereto. This brings the notch 19 in red 16 into position or the free end or" arm 21 to drop down into the same in the path of pin 23 which coming in contact with arm 21 halts the mot-ion of the turn-table. At the same time the free end of arm 21 is moved just far enough by contact of pin. 23, to move the,

pointer end over to the opposite position from that shown in Fig. 1, and which has the effect of moving the knitt-switch to its opening position. ..llthe parts are so timed and adjusted with reference to each other that they are actuated simultaneously. The machine is now at rest and the different parts may be returned to their normal playing position by grasping the handle end 31 of rod 16 and drawing same back from its engagement with notch 15 and turning disk 9 back to bring the finger 13 to its indicating position on scale 14. W hen rod 16 is retracted the inner end of arm 21 rides up the sloping wall and rests on top of the rod 16 and away from the travel path of pin 23; The switch finger must be returned by hand to its circuit closing position. iii. plate 33 having on and off marked on the respective ends indicates in connection with iinger 25 the open and closed positions of the circuit. 7

Rod 16 is provided with a cushion 32 which is adapted to contact the adjacent wall of the turn table and ease the shock when the end of the rod is forced into notch 15.

The gear 84:, mounted on the lower end of the turn-table spindle C, provides the operativetransmission connection with the source of motive power.

" mean-o5 1 do not limit myself to the specific de tails of construction and arrangement shown, but may make such changes as practical working requires, without departing from the spirit of my invention.

Having thus described my invention, what 1 claim is- 1. In an. automatic stop for phonographs, a tone-arm, a hub-part, a bearing ring therefor, a gage-ring loosely mounted on said hub-part, a friction disk bearing on said gage-ring, and a clamping collar bearing on said disk and adjustable on the tone-arm.

2. An automatic stop for phonographs, comprising a tone-arm, a hub bearing therefor, a friction disk loosely mounted in place, a flexible washer interposed between said disk and tone-arm, and an adjustable clamping collar, whereby said disk is made to turn with the tone-arm or adapted to be manually manipulated in setting the same for playing records of dii'lerent lengths.

3. In automatic stop mechanism for phonographs, a friction disk loosely mounted thereon and provided with an indicating finger and a notch spaced apart therefrom, means associated with said disk whereby the same will turn mechanically with the tonearm or be manually manipulated, a stop-rod capable of an endwise movement and adapted to engage said notch, a gage-ring on one end oi: which said rod has a riding bearing, and means for holding said rod and ring in operative engagement.

4c. in an automatic stop for phonographs a tone-arm, means for limiting the movement thereof in accordance with the length the record being played, a turn-table provided in the hub part a fixed pin, a stop rod capable of an endwise movement and provided with a notch in the upper side thereof, trip-arm having its free end resting on said rod adjacent to said notch, a switch finger in pivotal engagement with said trip arm, a switch lever, and the operative connection between said finger and lever, whereby the electric circuit is automatically shut oii in stopping the playing mechanism.

in testimony whereof I aiiiX my signature in presence of two Witnesses.

l/VALTEE J. BAKER.

Witnesses A. H. STANTON, G. E. OH RoH. 

